<template>
  <el-card class="box-card">
    <div slot="header" class="clearfix">
      <span>更换头像</span>
    </div>
    <div>
      <!-- 图片，用来展示用户选择的头像 -->
      <img v-if="avatar" :src="avatar" />
      <img
        v-else
        src="../../../assets/images/avatar.jpg"
        alt=""
        class="preview"
      />

      <!-- 按钮区域 -->
      <div class="btn-box">
        <input
          type="file"
          accept="image/*"
          style="display: none"
          ref="iptRef"
          @input="onFileChange"
        />
        <el-button
          type="primary"
          icon="el-icon-plus"
          @click="$refs.iptRef.click()"
          >选择图片</el-button
        >
        <el-button
          type="success"
          icon="el-icon-upload"
          :disabled="!avatar"
          @click="uploadImage"
          >上传头像</el-button
        >
      </div>
    </div>
  </el-card>
</template>

<script>
export default {
  name: "UserAvatar",
  data() {
    return {
      avatar: "",
    };
  },
  methods: {
    onFileChange(e) {
      const files = e.target.files;
      if (files.length > 0) {
        // 选中了图片
        console.log(files[0]);
        // 通过 创建 new FileReader()
        const reader = new FileReader();
        // 使用readAsDataURL方法 将文件转为base64
        reader.readAsDataURL(files[0]);
        // 监听 onload 事件 文件读取成功时触发
        reader.onload = () => {
          this.avatar = reader.result;
        };
      } else {
        // 没有选中图片
        this.avatar = "";
      }
    },
    async uploadImage() {
      // 发送请求
      const { data: res } = await this.$axios.patch("/my/update/avatar", {
        avatar: this.avatar,
      });
      // console.log(this.avatar);
      console.log(res);
      if (res.code !== 0) return this.$message.error(res.message);
      this.$message.success(res.message);
      this.$store.dispatch("initUserInfo");
      this.avatar = "";
    },
  },
};
</script>

<style lang="less" scoped>
.btn-box {
  margin-top: 10px;
}
.preview {
  object-fit: cover;
  width: 350px;
  height: 350px;
}
</style>
